Jack



Oct. 28, 1941.

C. S. JOHNSTON JACK Filed Jan. 9, 19 0 2 Sheets-Sheet l came/we s. JOHNSTON Oct; 28, 1941. c. s. JOHNSTON 2,260,993

JACK

I Fil edJan. 9, 1940 2 Sheets-Sheet 2 Patented Oct. 28, 1941 UNITED STATES PATENT OFFICE Application January 9, 1940, Serial No. 313,106 (Cl. 254111) 6 Claims.

This invention relates to jacks, and has for one of its objects the production of a simple and eflicient means for elevating the jack through th manipulation of an actuating handle.

Another object of this invention is the production, of a jack which is so constructed as to allow the jack to be operated at high speed of two notches at a time, or adjusted for operation at low speed of one notch at a time.

A further object of this invention is the production of a simple and efiicient means for controlling the lowering of the jack at the will of the operator.

Other objects and advantages of the present invention will be apparent throughout the following specification and claims.

In the drawings- Figure l is a side elevational View of the-jack, certain parts being shown in vertical section;

Figure 2 is a front elevational view of the jack, certain parts being shown in section;

Figure 3 is a vertical sectional view taken on line 3--3 of Figure 2;

Figure 4 is a transverse sectional view taken on line 44 of Figure 3;

Figure 5 is a transverse sectional View taken on line 5-5 of Figure 1; I

Figure 6 is a vertical sectional view through a vehicle wheel showing the manner of using the jack for engaging a wheel and a second jack for supporting an axle;

Figure 7 is a side elevational view of the axle supporting jack;

Figure 8 is a vertical sectional view of a modified form of jack to that shown in Figure 3.

By referring to the drawings, it will be seen that ill designates the base which supports a vertical tubular standard II. with a vertical socket I2 preferably located at the center thereof, the inner end of the socket l2 being cone-shaped, as indicated at 13, for receiving the beveled or wedge-shaped end portion l4 of the standard II. An auxiliary socket i5 is carried by the base to one side of the socket l2, the socket I extending at an incline to the vertical axis of the base In and also being coneshaped, as at "5, at its inner end.

The tubular standard II is provided with a,

an eflicient case in which the handle l8 may be stored.

This base I0 is provided A lifting sleeve I9 is slidably mounted upon the.

standard I I andis provided with a pair of spaced laterally extending flanges 20 between which flanges 20 is journaled an eccentric 2| upon a journal pin 22, the journal pin being fixed to the eccentric 2| and rotatably mounted through the flanges 20, as shown in Figure 4. One end of the journal pin 22 is flxed in any suitable manner to a shank 23 by being molded thereon, or otherwise secured, which shank 23 isadapted toreceive the detachable operating handle [8 previously described.

. -A lifting latch 24-is carried by the eccentric 2| and the latch 24- is provided with a toothengaging end 25 which is adapted to engage the teeth or notches ll of the standard II, as shown. A retaining latch 26 is pivotally secured upon a journal pin 21 between the upper ends of the flanges 20, and this retaining latch 26 is also adapted to engage the teeth or notches I! to retard downward movement of the teeth l1 upon the standard I I. This retaining latch 26 is provided with a rearwardly extending lug 28 which is adapted to be engaged by the end of the latch spring 29 in a manner whereby the retaining latch 26 may be held out of engagement with the notches or teeth 11, as will be hereinafter described. This retaining latch 26 is provided with a laterally extending arm 30 near its lower end, which arm 30 extends through an arc-shaped slot 3| formed in one of the flanges 20 to facilitate the manual moving of the retaining latch 26 to and from an engaging position with respect I by one side of the eccentric 2|, the shoulder 34 being in the path of movement of the boss 35, as the eccentric 3! is rotated in a clockwise direction-note Figure 3. As the boss 35 is moved into engagement with the shoulder 34, the trigger plate 32 will be rotated to swing the arm 33 against the arm 30 and in this way kick or move the retaining latch 26 out of engagement with the hatches or teeth I! and causing the rearwardly extending lug 28 to engage the end of the latch spring 29, thereby holding the retaining latch 26 in an inoperative position or in the position shown in dotted lines in Figure 3. The lifting latch 24 is provided with an upstanding boss 36 on the top portion thereof and in a position to engage the arm 30 when the retaining latch 26 is in its dotted position whereby the movement of the handle l8 upwardly and toward the upper end of the standard II will cause this boss 36 to contact the arm 30 moving the retaining latch 26 toward the standard II and disengaging the lug 28 from the spring latch 29.

A cam lever 31 is pivotally secured to the lifting latch 24, as shown in Figure 3, and engages a fiat spring 38 carried by the latch 24 for moving this spring toward the transversely extending rivet 39 carried by the sleeve I9 and moving the latch laterally to the position shown in dotted lines in Figure 3 when the lever 31 is raised to the dotted position shown in Figure 3. When the lifting latch 24 is moved to its dotted position, the teeth engaging end 25 will be moved laterally or beyond the teeth or notches I1 of the standard II or to a position which would cause the end 25 of the lifting latch 24 to engage the tooth next below that shown in Figure 3, when the handle I8 is lowered and the eccentric 2| is rotated in a clockwise direction.

When the handle I8 is forced downwardly, the boss 35 will engage the shoulder 34, swinging the trigger plate 32 and causing the arm 33 to contact the arm 30 and move the retaining latch 26 into locking engagement with the latch spring 29. By manually swinging the lever 31 upwardly to the position shown in dotted lines in Figure 3, the spring 38 will be forced into contacting position shown in dotted lines in Figure 3, with the rivet 39. When the handle I8 is raised, the boss 36 on the top end of the lifting latch 24 will con tact the arm 30 and force the retaining latch 26 out of locking engagement with the latch spring 29. The retaining latch 26 then drops into the next lower notch or tooth I1 on the standard II, and the spring 38 will ride against the rivet 39 preventing the lifting latch 24 from dropping into the notch which it has just left, thereby causing the lower end 25 of the latch 24 to follow into the next lower notch I1. This action will cause the load to be stepped down one notch at a time. By manipulating the handle I8 as described above, it will be seen that the retaining latch 26 may be automatically moved to and from an operative as well as an inoperative position. A torsion spring 38' may be anchored at one end to the inner face of one of the flanges 26 and at the other end near the lower portion of the lifting latch 24, as shown in Figures 1 and. 2 to normally urge the latch 24 into engagement with the standard I I. This spring 38 is preferably placed on the opposite side of the latch 24 with respect to the lever 31.

As shown, the sleeve l9 carries a lifting hook 49 at its upper end, which hook is supported upon suitable lugs 4| carried by the sleeve, and is retained against displacement by laterally bent ears 42 at the upper end of the sleeve I9. The lifting hook 40 is provided with laterally extending ears 43, the upper edges of which are formed on the arc of a circle, as indicated at 44, and are notched, as at 45, the lifting hook 40 and cars 43 being preferably shaped to conform to the contour of the hub of a wheel whereby the jack may be used in a manner as shown in Figure 6 hereinafter described.

.By means of the jack mechanism illustrated and described, the handle I8 may be stepped-up two notches at a time for high speed. For low speed and power the retaining latch 26 is forced up as far as possible. The handle shank 23 is then raised to permit the lower latch to fall into the lower notch which increases the lifting power.

It should be understood that the jack is actuated by raising and lowering the handle l8 and shank 23 in a pumping action and when a weight rests upon the lifting hook 40, the lifting latch 24 will force the sleeve I9 upwardly, as the handle I8 is lowered, and the retaining latch 26 will fall into the notches or teeth l1 and prevent the descent of the sleeve I9 upon the standard II. When it is desired to permit the sleeve I9 to slide downwardly upon the standard and disengage the jack from. the object which is being lifted, the handle I8 is forced downwardly to the point Where the boss 35 contacts the shoulder 34 of the trigger member 32, and a further downward movement of the handle will cause the trigger member 32 to kick the retaining latch 26 out of engagement with the notches or teeth I1 and the lifting latch 24 will also be disengaged in this way permitting the sleeve I9 to slide downwardly to a disengaging position.

The jack may be used as a bumper jack in the conventional manner by having the lifting hook 40 engage a bum-per, or the device may be used in the manner as illustrated in Figure 6, where the hook 40 may engage the wheel flange 45' of the wheel 46 or the outer end of the axle 41 for elevating the wheel to a desired position in the event the standard II is seated within the incined socket I5 of the base I6, as shown. When the wheel 46 is lifted to the position shown in Figure 6, I preferably employ a spring jack of the type shown in Figures 6 and '1, for engaging the axle after the wheel has been lifted to support the axle 41. The spring jack shown in detail in Figure '1 embodies a base 48 in which is slidably mounted a lifting shank 49 which is normally forced upwardly by means of an expansion spring 50 mounted within the base 48. The base 48 is preferably split as indicated at 5|, the split portion being adapted to be drawn together by means of a bolt 52 which extends through the base and is engaged by a cam operating handle 53. By swinging the handle 53 downwardly the split portion of the base will be drawn tightly about the shank 49 and in this way hold the shank 49 ina set adjusted position to support the axle 41, at which time the hook 46 may be disengaged from the wheel flange 46' and the lifting jack removed so that the wheel 46 may be removed from the axle 41. Should it be desired any suitable adjustable support may be placed under the axle without departing from the spirit of the invention. The jack shown in Figure '1 and also Figure 6, for supporting the axle 41 may be released from the axle 41 by swinging the handle 53 upwardly and permitting the axle to assume its normal position after the wheel has been replaced.

In Figure 8 I have shown a modified form of the invention, wherein I employ a standard II a upon which is slidably mounted a sleeve I9a somewhat similar to the sleeve I9. This sleeve I9a carries a pivotally mounted handle shank 23a which is pivoted, as at 22a upon a journal pin carried by the sleeve I9a. A friction brake shoe 54 is pivotally carried by a journal pin 55 at its upper end, the friction brake shoe also carrying a retaining latch 56 similar to the latch 26 for engaging the teeth or notches l1a of the stand- :ard Ila. A lifting latch 51 is pivotally secured, as at 58, to the handle shank 23a and a torsion spring 59 normally holds the lifting latch 51 in engagement with the notches or teeth I1a of the standard Ila. A trigger plate 66 is journaled upon the pin 22a and has an upwardly extending arm 6| which engages a laterally extending finger 62 of the retaining latch 56. A boss 63 is formed upon the handle shank 23 and is adapted to engage the shoulder 64 at the bottom of the trigger 60 for swinging the trigger 60 and kicking the retaining latch 56 to a disengaging position as the handle shank 23a is moved in the direction of the arrow shown in Figure 8. A boss 65 is carried by the upper face of the shank 23a and is adapted to engage the arm 62 for moving the retaining latch 56 into a tooth-engaging position the same in a disengaging position until released.

The lifting latch 51 may be swung outwardly from the shank Ila to a position where it will step-up a distance of two teeth at one operation, and this latch 51 may be moved to the position shown in dotted lines in Figure 8 by sliding the clip 61 upwardly to the position shown in dotted lines in Figure 8, thereby moving the flat spring 68 to the dotted line position which will cause the lifting latch 51 to be moved to the dotted line position shown in Figure 8. Figure 8 discloses a slightly modified form wherein the friction grip shoe 54 is employed and is actuated by the cam inner end 69 of the shank 23 and by means of this structure the friction shoe 54 will permit the sleeve I90 to slide downwardly and be controlled bythe position of the handle shank 23a and the handle l8a. This friction grip shoe 54 is somewhat similar to the structure shown in my previous application for patent, Serial Number 246,691, filed December 19, 1938, patented April 9, 1940, as Patent No. 2, d ope ating in a manner similar to this structure so far as the cam and friction shoe are concerned.

It should be understood that certain detail changes in the mechanical construction and arrangement of parts may be employed without departing from the spirit of the invention so long as such changes fall within the scope of the appended claims.

Having described the invention, what is claimed 1. A jack of the class described comprising a standard, a sleeve having article lifting means, said sleeve being slidably mounted upon the standard, a retaining latch carried by the sleeve, the sleeve having means to be engaged by the retaining latch to hold the sleeve against descent, a lifting latch pivoted upon said sleeve and engaging the standard for moving the sleeve upwardly, an eccentric engaging the lifting latch, an operating handle for actuating the eccentric and elevating the sleeve as the operating handle is swung in one direction, means actuated by the eccentric for moving the retaining latch to an inoperative position when the operating handle is moved to one position, and means for engaging the retaining latch for moving the retaining latch to an operative position when the operating handle is moved to a second position.

2. A jack of the class described comprising a standard, a lifting sleeve slidably mounted upon the standard, a retaining latch adapted to engage the standard for holding the standard against descent, an eccentric pivotally mounted upon the sleeve, a lifting latch carried by the eccentric and adapted to engage the standard for elevating the sleeve as the eccentric is rotated, a handle for rotating the eccentric, a trigger pivotally mounted upon the sleeve, a boss carried by the eccentric for engaging the trigger and swinging the same, and means carried by the retaining latch engageable by the trigstandard, a lifting sleeve slidably mounted upon the standard, a retaining latch adapted to engage the standard for holding the standard against descent, an eccentric pivotally mounted upon the sleeve, a lifting latch carried by the eccentric and adapted to engage the standard for elevating the sleeve as the eccentric is-rotated, a handle for rotating the eccentric, a trigger pivotally mounted upon the sleeve, 2. boss carried by the eccentric for engaging the trigger and swinging the same, means carried by the retaining latch engageable by the trigger for swingnig the retaining latch to a disengaging position, and a spring latch for engaging the retaining latch and detachably. holding the retaining latch in an inoperative position.

4. A jack of the class described comprising a standard, a lifting sleeve slidably mounted upon the standard, a retaining latch adapted to engage v the standard for holding the standard against descent, an eccentric pivotally mounted upon the sleeve, a lifting latch carried by the eccentric and adapted to engage the standard for elevating the sleeve as the eccentric is rotated, a handle for rotating the eccentric, a trigger pivotally mounted upon the sleeve, a boss carried by the eccentric for engaging the trigger and swinging the same, means carried by the retaining latch engageable by the trigger for swinging the retaining latch to a disengaging position, a spring latch for engaging the retaining latch and detachably holding the retaining latch in an inoperative position, and a boss carried by the lifting latch when the operating handle is moved to a selected position for releasing the retaining latch and moving the retaining latch to an operative position.

5. A jack of the class described comprising a standard, a lifting sleeve slidably mounted upon the standard, a retaining latch adapted to engage the standard for holding the standard against descent, an eccentric pivotally mounted upon the sleeve, a lifting latch carried by the eccentric and adapted to engage the standard for elevating the sleeve as the eccentric is rotated, a handle for rotating the eccentric, and means for shifting the position of the lifting latch upon the eccentric for regulating the distance of movement of the sleeve upon the standard at each operation of the handle.

6. A jack of the class described comprising a standard, a lifting sleeve slidably mounted upon the standard, a retaining latch adapted to engage the standard for holding the standard against descent, an eccentric pivotally mounted upon the sleeve, a lifting latch carried by the eccentric and adapted to engage the standard for elevating the sleeve as the eccentric is rotated, a handle for rotating the eccentric, a lever carried by the lifting latch, a spring carried by the lifting latch and shiftable laterally as the lever is swung to one position, an abutment carried by the sleeve and engageable by the spring for shifting the lifting latch laterally and moving the lifting latch upon the eccentric for regulating the distance of movement of the sleeve upon the standard as the handle is operated.

CLARENCE S. JOHNSTON. 

